Arm chair



FIG. 1 is a front perspective view of an arm chair showing my new design.

FIG. 2 is a rear elevational view;

FIG. 3 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 4 is a top plan view; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an arm chair, as shown and described. 